TSI Inc. serves a global market by investigating, identifying and solving measurement problems. As an industry leader in the design and production of precision measurement instruments, TSI partners with research institutions and customers around the world to set the standard for measurements relating to aerosol science, air flow, chemical analysis, indoor air quality, fluid dynamics, biohazard detection, and even scrap metal sorting and plastics identification. With headquarters based in the U.S. and field offices throughout Europe and Asia, TSI has established a worldwide presence in the markets we serve. Every day, our dedicated employees turn research into reality.

TSI has three wholly owned subsidiaries:

• DICKEY-john® Corporation (Auburn, Illinois), a manufacturer of specialized instrumentation used in public works and agriculture.
• Environmental Systems Corporation (Knoxville, Tennessee), a leading supplier of products and services for outdoor environmental monitoring.
• Tekran® Instruments Corporation (Knoxville, Tennessee), a premier supplier of ambient mercury monitoring technology.

Our facilities total more than 425,000 square feet of space devoted to product development, manufacturing and customer support.

TSI researchers and engineers have been granted more than 50 patents and have a proven record of developing instruments that are the first, the only, and the best of their kind. Participation in societies and standards committees has long been a TSI priority. Our engineers have chaired or sat on a variety of committees, with involvement in such organizations as ASHRAE, ANSI, AIHA and AAAR.

Our staff and products are involved in current global issues, such as diesel engine exhaust reduction, biohazard protection, homeland security, environmental pollution, workplace comfort and facility monitoring. Data provided by our instruments are used in monitoring and research applications destined to have a long-term impact on humankind and the world around us.

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